Let's not grab onto the first unsupported generality that comes our way ... Jim S. 

No problem there Jim. I'm a Mechanical Engineer and not the touchie feelie kind of guy. I don't normally go the way the wind blows. (In fact I've been accused of pissing into it far too often.)

 One thing I would like to hear explained about oxygenated Mogas by one of our chemists. How can oxygenated fuel help the emissions of a EFI car with a O2 sensor? My limited logic would conclude that if the O2 is liberated durring combustion that there would be free O2 in the exhaust and the sensor would richen the mixture until the issue was moot. That is just me thinking out loud, I could be wrong!

Bill Jepson